魏泰克的五界系统包括()、()、()、()和()。
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按照四界或五界生物分界系统,植物应包括的基本类群有各门真核藻类、()、()、()和()。
以下哪些是高架连续点源扩散模式建立的假定条件?
A. 全部高度风速均匀、稳定的
B. 源强是连续均匀稳定的
C. 污染物浓度在x、y方向上分布为正态分布
D. 扩散中污染物是守恒的
Please read Text A in Unit 8 and decide the following statement is True or False, or Not Given according to the text's information.Drugs should not be used during pregnancy unless absolutely necessary.
A. True
B. False
C. Not Given
Please read Text A in Unit 8 and decide the following statement is True or False, or Not Given according to the text's information.Once the container has been opened, the cotton ball can pull moisture into the bottle.
A. True
B. False
C. Not Given